He spends more money than he earns; you do the math
The company laid off half its employees but still expects to make a profit. You do the math
She works two jobs and still can't pay her rent. You do the math
They promised to lower prices, but the new product is smaller and more expensive. You do the math
He claims he's not tired, but he's fallen asleep three times already. You do the math
The train is delayed by an hour, and the next one isn't for two hours. You do the math
The recipe calls for a cup of sugar, but I only have half a cup. You do the math
They said the repair would take an hour, and it's been three. You do the math
He told me he'd be here by noon, and it's almost 3 PM. You do the math
The advertisement says it's a great deal, but when you look at the details, it's not. You do the math
That sounds like a lot of work for little reward.
It is, but the experience gained is invaluable. You do the math.
I suppose that makes sense for your career goals.
He spent all his savings on that car, so you do the math
His savings are gone; that car was very expensive
Considering his finances, the car's cost is obvious